The Adams is the most popular dry fly of all time. It effectively inmates a broad range of may flies and acts well as an attractor fly for searching out trout. You can use it well for a float source for a nymph dropped off its rear which doubles its effectiveness as many trout will grab the nymph below the floating adams first. Remeber 90% of the trout diet is sub surface eats! If you use it in this way if the Adams Dry Fly vanishes, set the hook!